mongoose预钩findOneAndUpdate修改从另一个集合获取的某些字段

const mongoose = require('mongoose');

// 定义Schema
const UserSchema = new mongoose.Schema({
  name: String,
  age: Number,
  email: String,
});

const PostSchema = new mongoose.Schema({
  title: String,
  content: String,
  author: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User', // 引用User模型
  },
});

// 在findOneAndUpdate之前执行预钩
PostSchema.pre('findOneAndUpdate', async function(next) {
  const post = this; // 获取当前Post实例

  // 从User集合中获取作者的email字段
  const user = await mongoose.model('User').findById(post.author);
  if (user) {
    post.authorEmail = user.email; // 修改Post实例的authorEmail字段
  }

  next();
});

// 创建模型
const User = mongoose.model('User', UserSchema);
const Post = mongoose.model('Post', PostSchema);

// 使用findOneAndUpdate更新Post实例
Post.findOneAndUpdate({ title: 'Some Title' }, { content: 'New Content' }, { new: true })
  .then(updatedPost => {
    console.log(updatedPost);
  })
  .catch(error => {
    console.error(error);
  });